:root {
  --night: #102a24;
  --ink: #173f35;
  --deep: #24523d;
  --moss: #47704b;
  --cream: #f3efcf;
  --paper: #dedcad;
  --gold: #e7b857;
  --rust: #b65f3f;
  --line: rgba(23, 63, 53, 0.16);
  --shadow: 0 16px 36px rgba(16, 42, 36, 0.16);
}

* { box-sizing: border-box; }

html { background: var(--night); }

body {
  margin: 0;
  color: var(--ink);
  background: linear-gradient(145deg, #f3efcf 0%, #e4e6c6 48%, #cad6ad 100%);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.5;
}

button, input, select { font: inherit; }
button, select, input[type="range"] { cursor: pointer; }

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 5;
  padding: .6rem .9rem;
  color: var(--cream);
  background: var(--night);
  border-radius: .5rem;
}
.skip-link:focus { top: 1rem; }

.site-header, .app-shell, footer { width: min(1240px, calc(100% - 2rem)); margin-inline: auto; }

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 2rem 0 1.25rem;
  color: var(--cream);
}

.brand-lockup, .header-actions, .panel-heading, .transport-row, .reset-row,
.allocation-labels, .forest-footer, .section-heading, .chart-title-row {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.brand-lockup h1, h2, h3, p { margin-top: 0; }
.brand-lockup h1 { margin-bottom: 0; font-size: clamp(1.4rem, 3vw, 2.2rem); }
.eyebrow, .chart-kicker { margin-bottom: .35rem; text-transform: uppercase; letter-spacing: .12em; font-size: .7rem; font-weight: 800; }
.eyebrow { color: var(--moss); }
.site-header .eyebrow { color: var(--paper); }
.brand-mark { display: flex; align-items: end; gap: 3px; height: 2.5rem; }
.brand-mark span { display: block; width: .55rem; background: var(--gold); border-radius: .2rem .2rem 0 0; }
.brand-mark span:nth-child(1) { height: 1.1rem; }
.brand-mark span:nth-child(2) { height: 1.8rem; }
.brand-mark span:nth-child(3) { height: 2.5rem; }

.model-chip, .year-badge, .crew-total {
  padding: .35rem .65rem;
  border: 1px solid rgba(243,239,207,.28);
  border-radius: 999px;
  color: var(--paper);
  font-size: .75rem;
}

.app-shell { padding-bottom: 2.5rem; }
.hero-note, .panel, .teaching-card {
  background: rgba(255,255,255,.78);
  border: 1px solid var(--line);
  border-radius: 1.1rem;
  box-shadow: var(--shadow);
}
.hero-note { display: grid; grid-template-columns: 1.1fr 1fr; gap: 2rem; padding: 1.5rem; margin-bottom: 1.25rem; }
.hero-note h2 { margin-bottom: 0; font-size: clamp(1.45rem, 3vw, 2.4rem); line-height: 1.1; }
.hero-note > p { margin: 0; align-self: end; }
.workspace-grid { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(320px, .75fr); gap: 1.25rem; }
.panel { padding: 1.15rem; }
.panel-heading { justify-content: space-between; margin-bottom: 1rem; }
.panel-heading.compact { align-items: flex-start; }
.panel-heading h2, .section-heading h2 { margin: 0; font-size: 1.25rem; }
.status-cluster { display: flex; align-items: center; flex-wrap: wrap; justify-content: flex-end; gap: .45rem; font-size: .8rem; }
.status-dot { width: .6rem; height: .6rem; border-radius: 50%; background: var(--rust); }
.status-dot.running { background: #6ca94e; box-shadow: 0 0 0 .25rem rgba(108,169,78,.18); }

.screen-bezel { position: relative; overflow: hidden; padding: .7rem; border-radius: .8rem; background: var(--night); }
.screen-toolbar { display: flex; justify-content: space-between; padding: 0 .25rem .5rem; color: var(--paper); font: .65rem ui-monospace, monospace; }
#forestCanvas { display: block; width: 100%; height: auto; image-rendering: pixelated; background: #789354; border-radius: .35rem; }
.scanlines { position: absolute; inset: 2.8rem .7rem .7rem; pointer-events: none; background: repeating-linear-gradient(0deg, transparent 0 3px, rgba(16,42,36,.08) 4px); }
.forest-footer { align-items: flex-start; justify-content: space-between; padding-top: .8rem; }
.legend { display: flex; flex-wrap: wrap; gap: .55rem .9rem; margin: 0; padding: 0; list-style: none; font-size: .75rem; }
.legend li { display: inline-flex; align-items: center; gap: .35rem; }
.legend-tree { width: .8rem; height: .8rem; display: inline-block; border-radius: 50%; background: #9eb65a; }
.legend-tree.birch { background: #f1e9c7; border: 2px solid #315044; }
.legend-tree.spruce { background: #47704b; }
.legend-tree.oak { background: #b65f3f; }
.legend-tree.empty { background: #809b58; border: 1px solid #587346; }
.tile-readout { margin: 0; color: var(--moss); font-size: .8rem; text-align: right; }

.control-stack { display: grid; gap: 1.25rem; }
.transport-row { flex-wrap: wrap; }
.button {
  border: 1px solid rgba(23,63,53,.25);
  border-radius: .65rem;
  padding: .62rem .8rem;
  color: var(--ink);
  background: rgba(255,255,255,.65);
  font-weight: 700;
}
.button:hover, .button:focus-visible { border-color: var(--gold); background: #fff; }
.button-primary { color: var(--cream); border-color: var(--deep); background: var(--deep); }
.button-small { padding: .45rem .65rem; }
.button-wide { flex: 1; }
.button-icon { color: var(--cream); border-color: rgba(243,239,207,.35); background: transparent; }
.speed-picker, .seed-row { display: flex; align-items: center; gap: .4rem; }
.speed-picker label, .field-label > span { display: block; color: var(--moss); font-size: .75rem; font-weight: 700; }
select, input[type="text"] { width: 100%; min-width: 0; padding: .55rem; border: 1px solid var(--line); border-radius: .5rem; color: var(--ink); background: #fff; }
.allocation-block { padding: 1rem 0; }
.allocation-labels { justify-content: space-between; font-size: .8rem; }
.allocation-labels > div { display: flex; flex-direction: column; }
.allocation-labels .align-right { text-align: right; }
.allocation-number { font-size: 1.7rem; font-weight: 800; line-height: 1; }
input[type="range"] { width: 100%; accent-color: var(--rust); }
.range-extremes { display: flex; justify-content: space-between; color: var(--moss); font-size: .65rem; }
.field-grid { display: grid; gap: .75rem; grid-template-columns: 1fr 1fr; }
.field-help, .field-error { margin: .45rem 0 0; font-size: .7rem; }
.field-help { color: var(--moss); }
.field-error { min-height: 1em; color: var(--rust); }
.reset-row { align-items: stretch; }
.metric-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: .75rem; }
.metric-card { padding: .85rem; border-left: .3rem solid var(--moss); border-radius: .7rem; background: rgba(255,255,255,.7); }
.metric-card.accent-gold { border-color: var(--gold); }
.metric-card.accent-lime { border-color: #9eb65a; }
.metric-card.accent-rust { border-color: var(--rust); }
.metric-card.accent-ink { border-color: var(--ink); }
.metric-wide { grid-column: 1 / -1; }
.metric-label, .metric-unit { display: block; color: var(--moss); font-size: .7rem; }
.metric-card strong { display: block; font-size: 1.35rem; }

.chart-section { margin-top: 1.25rem; }
.section-heading { justify-content: space-between; margin-bottom: 1rem; }
.section-heading > p { margin: 0; color: var(--moss); font-size: .8rem; text-align: right; }
.chart-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; }
.chart-title-row { justify-content: space-between; align-items: flex-start; }
.chart-title-row h3 { margin: 0; font-size: 1rem; }
.chart-kicker { color: var(--moss); }
.chart-legend { display: flex; flex-wrap: wrap; gap: .5rem; color: var(--moss); font-size: .7rem; }
.chart-legend span { display: inline-flex; align-items: center; gap: .25rem; }
.chart-legend i { display: inline-block; width: 1rem; border-top: 2px solid var(--ink); }
.chart-legend .line-cover, .chart-legend .line-harvest { border-color: var(--rust); }
.chart-legend .line-growth { border-color: #9eb65a; }
.chart-card canvas { display: block; width: 100%; height: auto; }
.chart-caption { margin: .25rem 0 0; color: var(--moss); font-size: .7rem; }
.learning-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1.25rem; margin-top: 1.25rem; }
.teaching-card { display: flex; gap: 1rem; padding: 1.25rem; background: var(--deep); color: var(--cream); }
.teaching-card .eyebrow { color: var(--paper); }
.teaching-card h2 { margin-bottom: .5rem; font-size: 1.35rem; }
.teaching-card p:last-child { margin-bottom: 0; }
.card-number { color: var(--gold); font: 800 1.8rem ui-monospace, monospace; }
.assumptions-panel summary { display: flex; justify-content: space-between; cursor: pointer; list-style: none; font-weight: 800; }
.assumptions-panel summary::-webkit-details-marker { display: none; }
.summary-icon { font-size: 1.4rem; }
.assumptions-content { padding-top: 1rem; }
.species-table-wrap { overflow-x: auto; }
table { width: 100%; border-collapse: collapse; font-size: .78rem; }
th, td { padding: .45rem; border-bottom: 1px solid var(--line); text-align: left; }
.assumption-list { padding-left: 1.2rem; font-size: .8rem; }
footer { display: flex; justify-content: space-between; gap: 1rem; padding: 1.25rem 0 2rem; color: var(--paper); font-size: .75rem; }

@media (max-width: 850px) {
  .site-header, .hero-note, .workspace-grid, .chart-grid, .learning-grid { grid-template-columns: 1fr; }
  .site-header { display: block; }
  .header-actions { margin-top: 1rem; }
  .hero-note { display: block; }
  .hero-note > p { margin-top: 1rem; }
}
@media (max-width: 560px) {
  .site-header, .app-shell, footer { width: min(100% - 1rem, 1240px); }
  .field-grid { grid-template-columns: 1fr; }
  .forest-footer, .section-heading, footer { display: block; }
  .tile-readout, .section-heading > p { margin-top: .75rem; text-align: left; }
  .reset-row { flex-wrap: wrap; }
}